1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
   4 *
   5 * The code this is based on carried the following copyright notice:
   6 * ---
   7 * (C) Copyright 2001-2006
   8 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
   9 * Re-worked by Ben Greear <greearb@candelatech.com>
  10 * ---
  11 */
  12#include <linux/kernel.h>
  13#include <linux/types.h>
  14#include <linux/module.h>
  15#include <linux/init.h>
  16#include <linux/errno.h>
  17#include <linux/slab.h>
  18#include <linux/string.h>
  19#include <linux/rculist.h>
  20#include <linux/notifier.h>
  21#include <linux/netdevice.h>
  22#include <linux/etherdevice.h>
  23#include <linux/net_tstamp.h>
  24#include <linux/ethtool.h>
  25#include <linux/if_arp.h>
  26#include <linux/if_vlan.h>
  27#include <linux/if_link.h>
  28#include <linux/if_macvlan.h>
  29#include <linux/hash.h>
  30#include <linux/workqueue.h>
  31#include <net/rtnetlink.h>
  32#include <net/xfrm.h>
  33#include <linux/netpoll.h>
  34#include <linux/phy.h>
  35
  36#define MACVLAN_HASH_BITS	8
  37#define MACVLAN_HASH_SIZE	(1<<MACVLAN_HASH_BITS)
  38#define MACVLAN_DEFAULT_BC_QUEUE_LEN	1000
  39
  40#define MACVLAN_F_PASSTHRU	1
  41#define MACVLAN_F_ADDRCHANGE	2
  42
  43struct macvlan_port {
  44	struct net_device	*dev;
  45	struct hlist_head	vlan_hash[MACVLAN_HASH_SIZE];
  46	struct list_head	vlans;
  47	struct sk_buff_head	bc_queue;
  48	struct work_struct	bc_work;
  49	u32			bc_queue_len_used;
  50	int			bc_cutoff;
  51	u32			flags;
  52	int			count;
  53	struct hlist_head	vlan_source_hash[MACVLAN_HASH_SIZE];
  54	DECLARE_BITMAP(bc_filter, MACVLAN_MC_FILTER_SZ);
  55	DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
  56	unsigned char           perm_addr[ETH_ALEN];
  57};
  58
  59struct macvlan_source_entry {
  60	struct hlist_node	hlist;
  61	struct macvlan_dev	*vlan;
  62	unsigned char		addr[6+2] __aligned(sizeof(u16));
  63	struct rcu_head		rcu;
  64};
  65
  66struct macvlan_skb_cb {
  67	const struct macvlan_dev *src;
  68};
  69
  70#define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
  71
  72static void macvlan_port_destroy(struct net_device *dev);
  73static void update_port_bc_queue_len(struct macvlan_port *port);
  74
  75static inline bool macvlan_passthru(const struct macvlan_port *port)
  76{
  77	return port->flags & MACVLAN_F_PASSTHRU;
  78}
  79
  80static inline void macvlan_set_passthru(struct macvlan_port *port)
  81{
  82	port->flags |= MACVLAN_F_PASSTHRU;
  83}
  84
  85static inline bool macvlan_addr_change(const struct macvlan_port *port)
  86{
  87	return port->flags & MACVLAN_F_ADDRCHANGE;
  88}
  89
  90static inline void macvlan_set_addr_change(struct macvlan_port *port)
  91{
  92	port->flags |= MACVLAN_F_ADDRCHANGE;
  93}
  94
  95static inline void macvlan_clear_addr_change(struct macvlan_port *port)
  96{
  97	port->flags &= ~MACVLAN_F_ADDRCHANGE;
  98}
  99
 100/* Hash Ethernet address */
 101static u32 macvlan_eth_hash(const unsigned char *addr)
 102{
 103	u64 value = get_unaligned((u64 *)addr);
 104
 105	/* only want 6 bytes */
 106#ifdef __BIG_ENDIAN
 107	value >>= 16;
 108#else
 109	value <<= 16;
 110#endif
 111	return hash_64(value, MACVLAN_HASH_BITS);
 112}
 113
 114static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
 115{
 116	return rcu_dereference(dev->rx_handler_data);
 117}
 118
 119static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
 120{
 121	return rtnl_dereference(dev->rx_handler_data);
 122}
 123
 124static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
 125					       const unsigned char *addr)
 126{
 127	struct macvlan_dev *vlan;
 128	u32 idx = macvlan_eth_hash(addr);
 129
 130	hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist,
 131				 lockdep_rtnl_is_held()) {
 132		if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
 133			return vlan;
 134	}
 135	return NULL;
 136}
 137
 138static struct macvlan_source_entry *macvlan_hash_lookup_source(
 139	const struct macvlan_dev *vlan,
 140	const unsigned char *addr)
 141{
 142	struct macvlan_source_entry *entry;
 143	u32 idx = macvlan_eth_hash(addr);
 144	struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
 145
 146	hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) {
 147		if (ether_addr_equal_64bits(entry->addr, addr) &&
 148		    entry->vlan == vlan)
 149			return entry;
 150	}
 151	return NULL;
 152}
 153
 154static int macvlan_hash_add_source(struct macvlan_dev *vlan,
 155				   const unsigned char *addr)
 156{
 157	struct macvlan_port *port = vlan->port;
 158	struct macvlan_source_entry *entry;
 159	struct hlist_head *h;
 160
 161	entry = macvlan_hash_lookup_source(vlan, addr);
 162	if (entry)
 163		return 0;
 164
 165	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
 166	if (!entry)
 167		return -ENOMEM;
 168
 169	ether_addr_copy(entry->addr, addr);
 170	entry->vlan = vlan;
 171	h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
 172	hlist_add_head_rcu(&entry->hlist, h);
 173	vlan->macaddr_count++;
 174
 175	return 0;
 176}
 177
 178static void macvlan_hash_add(struct macvlan_dev *vlan)
 179{
 180	struct macvlan_port *port = vlan->port;
 181	const unsigned char *addr = vlan->dev->dev_addr;
 182	u32 idx = macvlan_eth_hash(addr);
 183
 184	hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
 185}
 186
 187static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
 188{
 189	hlist_del_rcu(&entry->hlist);
 190	kfree_rcu(entry, rcu);
 191}
 192
 193static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
 194{
 195	hlist_del_rcu(&vlan->hlist);
 196	if (sync)
 197		synchronize_rcu();
 198}
 199
 200static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
 201					const unsigned char *addr)
 202{
 203	macvlan_hash_del(vlan, true);
 204	/* Now that we are unhashed it is safe to change the device
 205	 * address without confusing packet delivery.
 206	 */
 207	eth_hw_addr_set(vlan->dev, addr);
 208	macvlan_hash_add(vlan);
 209}
 210
 211static bool macvlan_addr_busy(const struct macvlan_port *port,
 212			      const unsigned char *addr)
 213{
 214	/* Test to see if the specified address is
 215	 * currently in use by the underlying device or
 216	 * another macvlan.
 217	 */
 218	if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
 219	    ether_addr_equal_64bits(port->dev->dev_addr, addr))
 220		return true;
 221
 222	if (macvlan_hash_lookup(port, addr))
 223		return true;
 224
 225	return false;
 226}
 227
 228
 229static int macvlan_broadcast_one(struct sk_buff *skb,
 230				 const struct macvlan_dev *vlan,
 231				 const struct ethhdr *eth, bool local)
 232{
 233	struct net_device *dev = vlan->dev;
 234
 235	if (local)
 236		return __dev_forward_skb(dev, skb);
 237
 238	skb->dev = dev;
 239	if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
 240		skb->pkt_type = PACKET_BROADCAST;
 241	else
 242		skb->pkt_type = PACKET_MULTICAST;
 243
 244	return 0;
 245}
 246
 247static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
 248{
 249	return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
 250}
 251
 252
 253static unsigned int mc_hash(const struct macvlan_dev *vlan,
 254			    const unsigned char *addr)
 255{
 256	u32 val = __get_unaligned_cpu32(addr + 2);
 257
 258	val ^= macvlan_hash_mix(vlan);
 259	return hash_32(val, MACVLAN_MC_FILTER_BITS);
 260}
 261
 262static void macvlan_broadcast(struct sk_buff *skb,
 263			      const struct macvlan_port *port,
 264			      struct net_device *src,
 265			      enum macvlan_mode mode)
 266{
 267	const struct ethhdr *eth = eth_hdr(skb);
 268	const struct macvlan_dev *vlan;
 269	struct sk_buff *nskb;
 270	unsigned int i;
 271	int err;
 272	unsigned int hash;
 273
 274	if (skb->protocol == htons(ETH_P_PAUSE))
 275		return;
 276
 277	hash_for_each_rcu(port->vlan_hash, i, vlan, hlist) {
 278		if (vlan->dev == src || !(vlan->mode & mode))
 279			continue;
 280
 281		hash = mc_hash(vlan, eth->h_dest);
 282		if (!test_bit(hash, vlan->mc_filter))
 283			continue;
 284
 285		err = NET_RX_DROP;
 286		nskb = skb_clone(skb, GFP_ATOMIC);
 287		if (likely(nskb))
 288			err = macvlan_broadcast_one(nskb, vlan, eth,
 289					mode == MACVLAN_MODE_BRIDGE) ?:
 290			      netif_rx(nskb);
 291		macvlan_count_rx(vlan, skb->len + ETH_HLEN,
 292				 err == NET_RX_SUCCESS, true);
 293	}
 294}
 295
 296static void macvlan_multicast_rx(const struct macvlan_port *port,
 297				 const struct macvlan_dev *src,
 298				 struct sk_buff *skb)
 299{
 300	if (!src)
 301		/* frame comes from an external address */
 302		macvlan_broadcast(skb, port, NULL,
 303				  MACVLAN_MODE_PRIVATE |
 304				  MACVLAN_MODE_VEPA    |
 305				  MACVLAN_MODE_PASSTHRU|
 306				  MACVLAN_MODE_BRIDGE);
 307	else if (src->mode == MACVLAN_MODE_VEPA)
 308		/* flood to everyone except source */
 309		macvlan_broadcast(skb, port, src->dev,
 310				  MACVLAN_MODE_VEPA |
 311				  MACVLAN_MODE_BRIDGE);
 312	else
 313		/*
 314		 * flood only to VEPA ports, bridge ports
 315		 * already saw the frame on the way out.
 316		 */
 317		macvlan_broadcast(skb, port, src->dev,
 318				  MACVLAN_MODE_VEPA);
 319}
 320
 321static void macvlan_process_broadcast(struct work_struct *w)
 322{
 323	struct macvlan_port *port = container_of(w, struct macvlan_port,
 324						 bc_work);
 325	struct sk_buff *skb;
 326	struct sk_buff_head list;
 327
 328	__skb_queue_head_init(&list);
 329
 330	spin_lock_bh(&port->bc_queue.lock);
 331	skb_queue_splice_tail_init(&port->bc_queue, &list);
 332	spin_unlock_bh(&port->bc_queue.lock);
 333
 334	while ((skb = __skb_dequeue(&list))) {
 335		const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
 336
 337		rcu_read_lock();
 338		macvlan_multicast_rx(port, src, skb);
 339		rcu_read_unlock();
 340
 341		if (src)
 342			dev_put(src->dev);
 343		consume_skb(skb);
 344
 345		cond_resched();
 346	}
 347}
 348
 349static void macvlan_broadcast_enqueue(struct macvlan_port *port,
 350				      const struct macvlan_dev *src,
 351				      struct sk_buff *skb)
 352{
 353	struct sk_buff *nskb;
 354	int err = -ENOMEM;
 355
 356	nskb = skb_clone(skb, GFP_ATOMIC);
 357	if (!nskb)
 358		goto err;
 359
 360	MACVLAN_SKB_CB(nskb)->src = src;
 361
 362	spin_lock(&port->bc_queue.lock);
 363	if (skb_queue_len(&port->bc_queue) < port->bc_queue_len_used) {
 364		if (src)
 365			dev_hold(src->dev);
 366		__skb_queue_tail(&port->bc_queue, nskb);
 367		err = 0;
 368	}
 369	spin_unlock(&port->bc_queue.lock);
 370
 371	queue_work(system_unbound_wq, &port->bc_work);
 372
 373	if (err)
 374		goto free_nskb;
 375
 376	return;
 377
 378free_nskb:
 379	kfree_skb(nskb);
 380err:
 381	dev_core_stats_rx_dropped_inc(skb->dev);
 382}
 383
 384static void macvlan_flush_sources(struct macvlan_port *port,
 385				  struct macvlan_dev *vlan)
 386{
 387	struct macvlan_source_entry *entry;
 388	struct hlist_node *next;
 389	int i;
 390
 391	hash_for_each_safe(port->vlan_source_hash, i, next, entry, hlist)
 392		if (entry->vlan == vlan)
 393			macvlan_hash_del_source(entry);
 394
 395	vlan->macaddr_count = 0;
 396}
 397
 398static void macvlan_forward_source_one(struct sk_buff *skb,
 399				       struct macvlan_dev *vlan)
 400{
 401	struct sk_buff *nskb;
 402	struct net_device *dev;
 403	int len;
 404	int ret;
 405
 406	dev = vlan->dev;
 407	if (unlikely(!(dev->flags & IFF_UP)))
 408		return;
 409
 410	nskb = skb_clone(skb, GFP_ATOMIC);
 411	if (!nskb)
 412		return;
 413
 414	len = nskb->len + ETH_HLEN;
 415	nskb->dev = dev;
 416
 417	if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
 418		nskb->pkt_type = PACKET_HOST;
 419
 420	ret = __netif_rx(nskb);
 421	macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 422}
 423
 424static bool macvlan_forward_source(struct sk_buff *skb,
 425				   struct macvlan_port *port,
 426				   const unsigned char *addr)
 427{
 428	struct macvlan_source_entry *entry;
 429	u32 idx = macvlan_eth_hash(addr);
 430	struct hlist_head *h = &port->vlan_source_hash[idx];
 431	bool consume = false;
 432
 433	hlist_for_each_entry_rcu(entry, h, hlist) {
 434		if (ether_addr_equal_64bits(entry->addr, addr)) {
 435			if (entry->vlan->flags & MACVLAN_FLAG_NODST)
 436				consume = true;
 437			macvlan_forward_source_one(skb, entry->vlan);
 438		}
 439	}
 440
 441	return consume;
 442}
 443
 444/* called under rcu_read_lock() from netif_receive_skb */
 445static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
 446{
 447	struct macvlan_port *port;
 448	struct sk_buff *skb = *pskb;
 449	const struct ethhdr *eth = eth_hdr(skb);
 450	const struct macvlan_dev *vlan;
 451	const struct macvlan_dev *src;
 452	struct net_device *dev;
 453	unsigned int len = 0;
 454	int ret;
 455	rx_handler_result_t handle_res;
 456
 457	/* Packets from dev_loopback_xmit() do not have L2 header, bail out */
 458	if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
 459		return RX_HANDLER_PASS;
 460
 461	port = macvlan_port_get_rcu(skb->dev);
 462	if (is_multicast_ether_addr(eth->h_dest)) {
 463		unsigned int hash;
 464
 465		skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
 466		if (!skb)
 467			return RX_HANDLER_CONSUMED;
 468		*pskb = skb;
 469		eth = eth_hdr(skb);
 470		if (macvlan_forward_source(skb, port, eth->h_source)) {
 471			kfree_skb(skb);
 472			return RX_HANDLER_CONSUMED;
 473		}
 474		src = macvlan_hash_lookup(port, eth->h_source);
 475		if (src && src->mode != MACVLAN_MODE_VEPA &&
 476		    src->mode != MACVLAN_MODE_BRIDGE) {
 477			/* forward to original port. */
 478			vlan = src;
 479			ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
 480			      __netif_rx(skb);
 481			handle_res = RX_HANDLER_CONSUMED;
 482			goto out;
 483		}
 484
 485		hash = mc_hash(NULL, eth->h_dest);
 486		if (test_bit(hash, port->bc_filter))
 487			macvlan_broadcast_enqueue(port, src, skb);
 488		else if (test_bit(hash, port->mc_filter))
 489			macvlan_multicast_rx(port, src, skb);
 490
 491		return RX_HANDLER_PASS;
 492	}
 493
 494	if (macvlan_forward_source(skb, port, eth->h_source)) {
 495		kfree_skb(skb);
 496		return RX_HANDLER_CONSUMED;
 497	}
 498	if (macvlan_passthru(port))
 499		vlan = list_first_or_null_rcu(&port->vlans,
 500					      struct macvlan_dev, list);
 501	else
 502		vlan = macvlan_hash_lookup(port, eth->h_dest);
 503	if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
 504		return RX_HANDLER_PASS;
 505
 506	dev = vlan->dev;
 507	if (unlikely(!(dev->flags & IFF_UP))) {
 508		kfree_skb(skb);
 509		return RX_HANDLER_CONSUMED;
 510	}
 511	len = skb->len + ETH_HLEN;
 512	skb = skb_share_check(skb, GFP_ATOMIC);
 513	if (!skb) {
 514		ret = NET_RX_DROP;
 515		handle_res = RX_HANDLER_CONSUMED;
 516		goto out;
 517	}
 518
 519	*pskb = skb;
 520	skb->dev = dev;
 521	skb->pkt_type = PACKET_HOST;
 522
 523	ret = NET_RX_SUCCESS;
 524	handle_res = RX_HANDLER_ANOTHER;
 525out:
 526	macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
 527	return handle_res;
 528}
 529
 530static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
 531{
 532	const struct macvlan_dev *vlan = netdev_priv(dev);
 533	const struct macvlan_port *port = vlan->port;
 534	const struct macvlan_dev *dest;
 535
 536	if (vlan->mode == MACVLAN_MODE_BRIDGE) {
 537		const struct ethhdr *eth = skb_eth_hdr(skb);
 538
 539		/* send to other bridge ports directly */
 540		if (is_multicast_ether_addr(eth->h_dest)) {
 541			skb_reset_mac_header(skb);
 542			macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
 543			goto xmit_world;
 544		}
 545
 546		dest = macvlan_hash_lookup(port, eth->h_dest);
 547		if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
 548			/* send to lowerdev first for its network taps */
 549			dev_forward_skb(vlan->lowerdev, skb);
 550
 551			return NET_XMIT_SUCCESS;
 552		}
 553	}
 554xmit_world:
 555	skb->dev = vlan->lowerdev;
 556	return dev_queue_xmit_accel(skb,
 557				    netdev_get_sb_channel(dev) ? dev : NULL);
 558}
 559
 560static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
 561{
 562#ifdef CONFIG_NET_POLL_CONTROLLER
 563	return netpoll_send_skb(vlan->netpoll, skb);
 564#else
 565	BUG();
 566	return NETDEV_TX_OK;
 567#endif
 568}
 569
 570static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
 571				      struct net_device *dev)
 572{
 573	struct macvlan_dev *vlan = netdev_priv(dev);
 574	unsigned int len = skb->len;
 575	int ret;
 576
 577	if (unlikely(netpoll_tx_running(dev)))
 578		return macvlan_netpoll_send_skb(vlan, skb);
 579
 580	ret = macvlan_queue_xmit(skb, dev);
 581
 582	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 583		struct vlan_pcpu_stats *pcpu_stats;
 584
 585		pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
 586		u64_stats_update_begin(&pcpu_stats->syncp);
 587		u64_stats_inc(&pcpu_stats->tx_packets);
 588		u64_stats_add(&pcpu_stats->tx_bytes, len);
 589		u64_stats_update_end(&pcpu_stats->syncp);
 590	} else {
 591		this_cpu_inc(vlan->pcpu_stats->tx_dropped);
 592	}
 593	return ret;
 594}
 595
 596static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 597			       unsigned short type, const void *daddr,
 598			       const void *saddr, unsigned len)
 599{
 600	const struct macvlan_dev *vlan = netdev_priv(dev);
 601	struct net_device *lowerdev = vlan->lowerdev;
 602
 603	return dev_hard_header(skb, lowerdev, type, daddr,
 604			       saddr ? : dev->dev_addr, len);
 605}
 606
 607static const struct header_ops macvlan_hard_header_ops = {
 608	.create  	= macvlan_hard_header,
 609	.parse		= eth_header_parse,
 610	.cache		= eth_header_cache,
 611	.cache_update	= eth_header_cache_update,
 612	.parse_protocol	= eth_header_parse_protocol,
 613};
 614
 615static int macvlan_open(struct net_device *dev)
 616{
 617	struct macvlan_dev *vlan = netdev_priv(dev);
 618	struct net_device *lowerdev = vlan->lowerdev;
 619	int err;
 620
 621	if (macvlan_passthru(vlan->port)) {
 622		if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 623			err = dev_set_promiscuity(lowerdev, 1);
 624			if (err < 0)
 625				goto out;
 626		}
 627		goto hash_add;
 628	}
 629
 630	err = -EADDRINUSE;
 631	if (macvlan_addr_busy(vlan->port, dev->dev_addr))
 632		goto out;
 633
 634	/* Attempt to populate accel_priv which is used to offload the L2
 635	 * forwarding requests for unicast packets.
 636	 */
 637	if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
 638		vlan->accel_priv =
 639		      lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
 640
 641	/* If earlier attempt to offload failed, or accel_priv is not
 642	 * populated we must add the unicast address to the lower device.
 643	 */
 644	if (IS_ERR_OR_NULL(vlan->accel_priv)) {
 645		vlan->accel_priv = NULL;
 646		err = dev_uc_add(lowerdev, dev->dev_addr);
 647		if (err < 0)
 648			goto out;
 649	}
 650
 651	if (dev->flags & IFF_ALLMULTI) {
 652		err = dev_set_allmulti(lowerdev, 1);
 653		if (err < 0)
 654			goto del_unicast;
 655	}
 656
 657	if (dev->flags & IFF_PROMISC) {
 658		err = dev_set_promiscuity(lowerdev, 1);
 659		if (err < 0)
 660			goto clear_multi;
 661	}
 662
 663hash_add:
 664	macvlan_hash_add(vlan);
 665	return 0;
 666
 667clear_multi:
 668	if (dev->flags & IFF_ALLMULTI)
 669		dev_set_allmulti(lowerdev, -1);
 670del_unicast:
 671	if (vlan->accel_priv) {
 672		lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 673							   vlan->accel_priv);
 674		vlan->accel_priv = NULL;
 675	} else {
 676		dev_uc_del(lowerdev, dev->dev_addr);
 677	}
 678out:
 679	return err;
 680}
 681
 682static int macvlan_stop(struct net_device *dev)
 683{
 684	struct macvlan_dev *vlan = netdev_priv(dev);
 685	struct net_device *lowerdev = vlan->lowerdev;
 686
 687	if (vlan->accel_priv) {
 688		lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
 689							   vlan->accel_priv);
 690		vlan->accel_priv = NULL;
 691	}
 692
 693	dev_uc_unsync(lowerdev, dev);
 694	dev_mc_unsync(lowerdev, dev);
 695
 696	if (macvlan_passthru(vlan->port)) {
 697		if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 698			dev_set_promiscuity(lowerdev, -1);
 699		goto hash_del;
 700	}
 701
 702	if (dev->flags & IFF_ALLMULTI)
 703		dev_set_allmulti(lowerdev, -1);
 704
 705	if (dev->flags & IFF_PROMISC)
 706		dev_set_promiscuity(lowerdev, -1);
 707
 708	dev_uc_del(lowerdev, dev->dev_addr);
 709
 710hash_del:
 711	macvlan_hash_del(vlan, !dev->dismantle);
 712	return 0;
 713}
 714
 715static int macvlan_sync_address(struct net_device *dev,
 716				const unsigned char *addr)
 717{
 718	struct macvlan_dev *vlan = netdev_priv(dev);
 719	struct net_device *lowerdev = vlan->lowerdev;
 720	struct macvlan_port *port = vlan->port;
 721	int err;
 722
 723	if (!(dev->flags & IFF_UP)) {
 724		/* Just copy in the new address */
 725		eth_hw_addr_set(dev, addr);
 726	} else {
 727		/* Rehash and update the device filters */
 728		if (macvlan_addr_busy(vlan->port, addr))
 729			return -EADDRINUSE;
 730
 731		if (!macvlan_passthru(port)) {
 732			err = dev_uc_add(lowerdev, addr);
 733			if (err)
 734				return err;
 735
 736			dev_uc_del(lowerdev, dev->dev_addr);
 737		}
 738
 739		macvlan_hash_change_addr(vlan, addr);
 740	}
 741	if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
 742		/* Since addr_change isn't set, we are here due to lower
 743		 * device change.  Save the lower-dev address so we can
 744		 * restore it later.
 745		 */
 746		ether_addr_copy(vlan->port->perm_addr,
 747				lowerdev->dev_addr);
 748	}
 749	macvlan_clear_addr_change(port);
 750	return 0;
 751}
 752
 753static int macvlan_set_mac_address(struct net_device *dev, void *p)
 754{
 755	struct macvlan_dev *vlan = netdev_priv(dev);
 756	struct sockaddr *addr = p;
 757
 758	if (!is_valid_ether_addr(addr->sa_data))
 759		return -EADDRNOTAVAIL;
 760
 761	/* If the addresses are the same, this is a no-op */
 762	if (ether_addr_equal(dev->dev_addr, addr->sa_data))
 763		return 0;
 764
 765	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 766		macvlan_set_addr_change(vlan->port);
 767		return dev_set_mac_address(vlan->lowerdev, addr, NULL);
 768	}
 769
 770	if (macvlan_addr_busy(vlan->port, addr->sa_data))
 771		return -EADDRINUSE;
 772
 773	return macvlan_sync_address(dev, addr->sa_data);
 774}
 775
 776static void macvlan_change_rx_flags(struct net_device *dev, int change)
 777{
 778	struct macvlan_dev *vlan = netdev_priv(dev);
 779	struct net_device *lowerdev = vlan->lowerdev;
 780
 781	if (dev->flags & IFF_UP) {
 782		if (change & IFF_ALLMULTI)
 783			dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 784		if (!macvlan_passthru(vlan->port) && change & IFF_PROMISC)
 785			dev_set_promiscuity(lowerdev,
 786					    dev->flags & IFF_PROMISC ? 1 : -1);
 787
 788	}
 789}
 790
 791static void macvlan_compute_filter(unsigned long *mc_filter,
 792				   struct net_device *dev,
 793				   struct macvlan_dev *vlan, int cutoff)
 794{
 795	if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
 796		bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
 797	} else {
 798		DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
 799		struct netdev_hw_addr *ha;
 800
 801		bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
 802		netdev_for_each_mc_addr(ha, dev) {
 803			if (!vlan && ha->synced <= cutoff)
 804				continue;
 805
 806			__set_bit(mc_hash(vlan, ha->addr), filter);
 807		}
 808
 809		__set_bit(mc_hash(vlan, dev->broadcast), filter);
 810
 811		bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
 812	}
 813}
 814
 815static void macvlan_recompute_bc_filter(struct macvlan_dev *vlan)
 816{
 817	if (vlan->port->bc_cutoff < 0) {
 818		bitmap_zero(vlan->port->bc_filter, MACVLAN_MC_FILTER_SZ);
 819		return;
 820	}
 821
 822	macvlan_compute_filter(vlan->port->bc_filter, vlan->lowerdev, NULL,
 823			       vlan->port->bc_cutoff);
 824}
 825
 826static void macvlan_set_mac_lists(struct net_device *dev)
 827{
 828	struct macvlan_dev *vlan = netdev_priv(dev);
 829
 830	macvlan_compute_filter(vlan->mc_filter, dev, vlan, 0);
 831
 832	dev_uc_sync(vlan->lowerdev, dev);
 833	dev_mc_sync(vlan->lowerdev, dev);
 834
 835	/* This is slightly inaccurate as we're including the subscription
 836	 * list of vlan->lowerdev too.
 837	 *
 838	 * Bug alert: This only works if everyone has the same broadcast
 839	 * address as lowerdev.  As soon as someone changes theirs this
 840	 * will break.
 841	 *
 842	 * However, this is already broken as when you change your broadcast
 843	 * address we don't get called.
 844	 *
 845	 * The solution is to maintain a list of broadcast addresses like
 846	 * we do for uc/mc, if you care.
 847	 */
 848	macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL,
 849			       0);
 850	macvlan_recompute_bc_filter(vlan);
 851}
 852
 853static void update_port_bc_cutoff(struct macvlan_dev *vlan, int cutoff)
 854{
 855	if (vlan->port->bc_cutoff == cutoff)
 856		return;
 857
 858	vlan->port->bc_cutoff = cutoff;
 859	macvlan_recompute_bc_filter(vlan);
 860}
 861
 862static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
 863{
 864	struct macvlan_dev *vlan = netdev_priv(dev);
 865
 866	if (vlan->lowerdev->mtu < new_mtu)
 867		return -EINVAL;
 868	dev->mtu = new_mtu;
 869	return 0;
 870}
 871
 872static int macvlan_hwtstamp_get(struct net_device *dev,
 873				struct kernel_hwtstamp_config *cfg)
 874{
 875	struct net_device *real_dev = macvlan_dev_real_dev(dev);
 876
 877	return generic_hwtstamp_get_lower(real_dev, cfg);
 878}
 879
 880static int macvlan_hwtstamp_set(struct net_device *dev,
 881				struct kernel_hwtstamp_config *cfg,
 882				struct netlink_ext_ack *extack)
 883{
 884	struct net_device *real_dev = macvlan_dev_real_dev(dev);
 885
 886	if (!net_eq(dev_net(dev), &init_net))
 887		return -EOPNOTSUPP;
 888
 889	return generic_hwtstamp_set_lower(real_dev, cfg, extack);
 890}
 891
 892/*
 893 * macvlan network devices have devices nesting below it and are a special
 894 * "super class" of normal network devices; split their locks off into a
 895 * separate class since they always nest.
 896 */
 897static struct lock_class_key macvlan_netdev_addr_lock_key;
 898
 899#define ALWAYS_ON_OFFLOADS \
 900	(NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
 901	 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
 902
 903#define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
 904
 905#define MACVLAN_FEATURES \
 906	(NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
 907	 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
 908	 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
 909	 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
 910
 911#define MACVLAN_STATE_MASK \
 912	((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
 913
 914static void macvlan_set_lockdep_class(struct net_device *dev)
 915{
 916	netdev_lockdep_set_classes(dev);
 917	lockdep_set_class(&dev->addr_list_lock,
 918			  &macvlan_netdev_addr_lock_key);
 919}
 920
 921static int macvlan_init(struct net_device *dev)
 922{
 923	struct macvlan_dev *vlan = netdev_priv(dev);
 924	struct net_device *lowerdev = vlan->lowerdev;
 925	struct macvlan_port *port = vlan->port;
 926
 927	dev->state		= (dev->state & ~MACVLAN_STATE_MASK) |
 928				  (lowerdev->state & MACVLAN_STATE_MASK);
 929	dev->features 		= lowerdev->features & MACVLAN_FEATURES;
 930	dev->features		|= ALWAYS_ON_FEATURES;
 931	dev->hw_features	|= NETIF_F_LRO;
 932	dev->vlan_features	= lowerdev->vlan_features & MACVLAN_FEATURES;
 933	dev->vlan_features	|= ALWAYS_ON_OFFLOADS;
 934	dev->hw_enc_features    |= dev->features;
 
 935	netif_inherit_tso_max(dev, lowerdev);
 936	dev->hard_header_len	= lowerdev->hard_header_len;
 937	macvlan_set_lockdep_class(dev);
 938
 939	vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 940	if (!vlan->pcpu_stats)
 941		return -ENOMEM;
 942
 943	port->count += 1;
 944
 945	/* Get macvlan's reference to lowerdev */
 946	netdev_hold(lowerdev, &vlan->dev_tracker, GFP_KERNEL);
 947
 948	return 0;
 949}
 950
 951static void macvlan_uninit(struct net_device *dev)
 952{
 953	struct macvlan_dev *vlan = netdev_priv(dev);
 954	struct macvlan_port *port = vlan->port;
 955
 956	free_percpu(vlan->pcpu_stats);
 957
 958	macvlan_flush_sources(port, vlan);
 959	port->count -= 1;
 960	if (!port->count)
 961		macvlan_port_destroy(port->dev);
 962}
 963
 964static void macvlan_dev_get_stats64(struct net_device *dev,
 965				    struct rtnl_link_stats64 *stats)
 966{
 967	struct macvlan_dev *vlan = netdev_priv(dev);
 968
 969	if (vlan->pcpu_stats) {
 970		struct vlan_pcpu_stats *p;
 971		u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 972		u32 rx_errors = 0, tx_dropped = 0;
 973		unsigned int start;
 974		int i;
 975
 976		for_each_possible_cpu(i) {
 977			p = per_cpu_ptr(vlan->pcpu_stats, i);
 978			do {
 979				start = u64_stats_fetch_begin(&p->syncp);
 980				rx_packets	= u64_stats_read(&p->rx_packets);
 981				rx_bytes	= u64_stats_read(&p->rx_bytes);
 982				rx_multicast	= u64_stats_read(&p->rx_multicast);
 983				tx_packets	= u64_stats_read(&p->tx_packets);
 984				tx_bytes	= u64_stats_read(&p->tx_bytes);
 985			} while (u64_stats_fetch_retry(&p->syncp, start));
 986
 987			stats->rx_packets	+= rx_packets;
 988			stats->rx_bytes		+= rx_bytes;
 989			stats->multicast	+= rx_multicast;
 990			stats->tx_packets	+= tx_packets;
 991			stats->tx_bytes		+= tx_bytes;
 992			/* rx_errors & tx_dropped are u32, updated
 993			 * without syncp protection.
 994			 */
 995			rx_errors	+= READ_ONCE(p->rx_errors);
 996			tx_dropped	+= READ_ONCE(p->tx_dropped);
 997		}
 998		stats->rx_errors	= rx_errors;
 999		stats->rx_dropped	= rx_errors;
1000		stats->tx_dropped	= tx_dropped;
1001	}
1002}
1003
1004static int macvlan_vlan_rx_add_vid(struct net_device *dev,
1005				   __be16 proto, u16 vid)
1006{
1007	struct macvlan_dev *vlan = netdev_priv(dev);
1008	struct net_device *lowerdev = vlan->lowerdev;
1009
1010	return vlan_vid_add(lowerdev, proto, vid);
1011}
1012
1013static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
1014				    __be16 proto, u16 vid)
1015{
1016	struct macvlan_dev *vlan = netdev_priv(dev);
1017	struct net_device *lowerdev = vlan->lowerdev;
1018
1019	vlan_vid_del(lowerdev, proto, vid);
1020	return 0;
1021}
1022
1023static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1024			   struct net_device *dev,
1025			   const unsigned char *addr, u16 vid,
1026			   u16 flags,
1027			   struct netlink_ext_ack *extack)
1028{
1029	struct macvlan_dev *vlan = netdev_priv(dev);
1030	int err = -EINVAL;
1031
1032	/* Support unicast filter only on passthru devices.
1033	 * Multicast filter should be allowed on all devices.
1034	 */
1035	if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1036		return -EOPNOTSUPP;
1037
1038	if (flags & NLM_F_REPLACE)
1039		return -EOPNOTSUPP;
1040
1041	if (is_unicast_ether_addr(addr))
1042		err = dev_uc_add_excl(dev, addr);
1043	else if (is_multicast_ether_addr(addr))
1044		err = dev_mc_add_excl(dev, addr);
1045
1046	return err;
1047}
1048
1049static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1050			   struct net_device *dev,
1051			   const unsigned char *addr, u16 vid,
1052			   struct netlink_ext_ack *extack)
1053{
1054	struct macvlan_dev *vlan = netdev_priv(dev);
1055	int err = -EINVAL;
1056
1057	/* Support unicast filter only on passthru devices.
1058	 * Multicast filter should be allowed on all devices.
1059	 */
1060	if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1061		return -EOPNOTSUPP;
1062
1063	if (is_unicast_ether_addr(addr))
1064		err = dev_uc_del(dev, addr);
1065	else if (is_multicast_ether_addr(addr))
1066		err = dev_mc_del(dev, addr);
1067
1068	return err;
1069}
1070
1071static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1072					struct ethtool_drvinfo *drvinfo)
1073{
1074	strscpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1075	strscpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1076}
1077
1078static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1079					      struct ethtool_link_ksettings *cmd)
1080{
1081	const struct macvlan_dev *vlan = netdev_priv(dev);
1082
1083	return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1084}
1085
1086static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1087				       struct ethtool_ts_info *info)
1088{
1089	struct net_device *real_dev = macvlan_dev_real_dev(dev);
1090
1091	return ethtool_get_ts_info_by_layer(real_dev, info);
1092}
1093
1094static netdev_features_t macvlan_fix_features(struct net_device *dev,
1095					      netdev_features_t features)
1096{
1097	struct macvlan_dev *vlan = netdev_priv(dev);
1098	netdev_features_t lowerdev_features = vlan->lowerdev->features;
1099	netdev_features_t mask;
1100
1101	features |= NETIF_F_ALL_FOR_ALL;
1102	features &= (vlan->set_features | ~MACVLAN_FEATURES);
1103	mask = features;
1104
1105	lowerdev_features &= (features | ~NETIF_F_LRO);
1106	features = netdev_increment_features(lowerdev_features, features, mask);
1107	features |= ALWAYS_ON_FEATURES;
1108	features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1109
1110	return features;
1111}
1112
1113#ifdef CONFIG_NET_POLL_CONTROLLER
1114static void macvlan_dev_poll_controller(struct net_device *dev)
1115{
1116	return;
1117}
1118
1119static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1120{
1121	struct macvlan_dev *vlan = netdev_priv(dev);
1122	struct net_device *real_dev = vlan->lowerdev;
1123	struct netpoll *netpoll;
1124	int err;
1125
1126	netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1127	err = -ENOMEM;
1128	if (!netpoll)
1129		goto out;
1130
1131	err = __netpoll_setup(netpoll, real_dev);
1132	if (err) {
1133		kfree(netpoll);
1134		goto out;
1135	}
1136
1137	vlan->netpoll = netpoll;
1138
1139out:
1140	return err;
1141}
1142
1143static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1144{
1145	struct macvlan_dev *vlan = netdev_priv(dev);
1146	struct netpoll *netpoll = vlan->netpoll;
1147
1148	if (!netpoll)
1149		return;
1150
1151	vlan->netpoll = NULL;
1152
1153	__netpoll_free(netpoll);
1154}
1155#endif	/* CONFIG_NET_POLL_CONTROLLER */
1156
1157static int macvlan_dev_get_iflink(const struct net_device *dev)
1158{
1159	struct macvlan_dev *vlan = netdev_priv(dev);
1160
1161	return vlan->lowerdev->ifindex;
1162}
1163
1164static const struct ethtool_ops macvlan_ethtool_ops = {
1165	.get_link		= ethtool_op_get_link,
1166	.get_link_ksettings	= macvlan_ethtool_get_link_ksettings,
1167	.get_drvinfo		= macvlan_ethtool_get_drvinfo,
1168	.get_ts_info		= macvlan_ethtool_get_ts_info,
1169};
1170
1171static const struct net_device_ops macvlan_netdev_ops = {
1172	.ndo_init		= macvlan_init,
1173	.ndo_uninit		= macvlan_uninit,
1174	.ndo_open		= macvlan_open,
1175	.ndo_stop		= macvlan_stop,
1176	.ndo_start_xmit		= macvlan_start_xmit,
1177	.ndo_change_mtu		= macvlan_change_mtu,
1178	.ndo_fix_features	= macvlan_fix_features,
1179	.ndo_change_rx_flags	= macvlan_change_rx_flags,
1180	.ndo_set_mac_address	= macvlan_set_mac_address,
1181	.ndo_set_rx_mode	= macvlan_set_mac_lists,
1182	.ndo_get_stats64	= macvlan_dev_get_stats64,
1183	.ndo_validate_addr	= eth_validate_addr,
1184	.ndo_vlan_rx_add_vid	= macvlan_vlan_rx_add_vid,
1185	.ndo_vlan_rx_kill_vid	= macvlan_vlan_rx_kill_vid,
1186	.ndo_fdb_add		= macvlan_fdb_add,
1187	.ndo_fdb_del		= macvlan_fdb_del,
1188	.ndo_fdb_dump		= ndo_dflt_fdb_dump,
1189#ifdef CONFIG_NET_POLL_CONTROLLER
1190	.ndo_poll_controller	= macvlan_dev_poll_controller,
1191	.ndo_netpoll_setup	= macvlan_dev_netpoll_setup,
1192	.ndo_netpoll_cleanup	= macvlan_dev_netpoll_cleanup,
1193#endif
1194	.ndo_get_iflink		= macvlan_dev_get_iflink,
1195	.ndo_features_check	= passthru_features_check,
1196	.ndo_hwtstamp_get	= macvlan_hwtstamp_get,
1197	.ndo_hwtstamp_set	= macvlan_hwtstamp_set,
1198};
1199
1200static void macvlan_dev_free(struct net_device *dev)
1201{
1202	struct macvlan_dev *vlan = netdev_priv(dev);
1203
1204	/* Get rid of the macvlan's reference to lowerdev */
1205	netdev_put(vlan->lowerdev, &vlan->dev_tracker);
1206}
1207
1208void macvlan_common_setup(struct net_device *dev)
1209{
1210	ether_setup(dev);
1211
1212	/* ether_setup() has set dev->min_mtu to ETH_MIN_MTU. */
1213	dev->max_mtu		= ETH_MAX_MTU;
1214	dev->priv_flags	       &= ~IFF_TX_SKB_SHARING;
1215	netif_keep_dst(dev);
1216	dev->priv_flags	       |= IFF_UNICAST_FLT | IFF_CHANGE_PROTO_DOWN;
 
1217	dev->netdev_ops		= &macvlan_netdev_ops;
1218	dev->needs_free_netdev	= true;
1219	dev->priv_destructor	= macvlan_dev_free;
1220	dev->header_ops		= &macvlan_hard_header_ops;
1221	dev->ethtool_ops	= &macvlan_ethtool_ops;
1222}
1223EXPORT_SYMBOL_GPL(macvlan_common_setup);
1224
1225static void macvlan_setup(struct net_device *dev)
1226{
1227	macvlan_common_setup(dev);
1228	dev->priv_flags |= IFF_NO_QUEUE;
1229}
1230
1231static int macvlan_port_create(struct net_device *dev)
1232{
1233	struct macvlan_port *port;
1234	unsigned int i;
1235	int err;
1236
1237	if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1238		return -EINVAL;
1239
1240	if (netdev_is_rx_handler_busy(dev))
1241		return -EBUSY;
1242
1243	port = kzalloc(sizeof(*port), GFP_KERNEL);
1244	if (port == NULL)
1245		return -ENOMEM;
1246
1247	port->dev = dev;
1248	ether_addr_copy(port->perm_addr, dev->dev_addr);
1249	INIT_LIST_HEAD(&port->vlans);
1250	for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1251		INIT_HLIST_HEAD(&port->vlan_hash[i]);
1252	for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1253		INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1254
1255	port->bc_queue_len_used = 0;
1256	port->bc_cutoff = 1;
1257	skb_queue_head_init(&port->bc_queue);
1258	INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1259
1260	err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1261	if (err)
1262		kfree(port);
1263	else
1264		dev->priv_flags |= IFF_MACVLAN_PORT;
1265	return err;
1266}
1267
1268static void macvlan_port_destroy(struct net_device *dev)
1269{
1270	struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1271	struct sk_buff *skb;
1272
1273	dev->priv_flags &= ~IFF_MACVLAN_PORT;
1274	netdev_rx_handler_unregister(dev);
1275
1276	/* After this point, no packet can schedule bc_work anymore,
1277	 * but we need to cancel it and purge left skbs if any.
1278	 */
1279	cancel_work_sync(&port->bc_work);
1280
1281	while ((skb = __skb_dequeue(&port->bc_queue))) {
1282		const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1283
1284		if (src)
1285			dev_put(src->dev);
1286
1287		kfree_skb(skb);
1288	}
1289
1290	/* If the lower device address has been changed by passthru
1291	 * macvlan, put it back.
1292	 */
1293	if (macvlan_passthru(port) &&
1294	    !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1295		struct sockaddr sa;
1296
1297		sa.sa_family = port->dev->type;
1298		memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1299		dev_set_mac_address(port->dev, &sa, NULL);
1300	}
1301
1302	kfree(port);
1303}
1304
1305static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1306			    struct netlink_ext_ack *extack)
1307{
1308	struct nlattr *nla, *head;
1309	int rem, len;
1310
1311	if (tb[IFLA_ADDRESS]) {
1312		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1313			return -EINVAL;
1314		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1315			return -EADDRNOTAVAIL;
1316	}
1317
1318	if (!data)
1319		return 0;
1320
1321	if (data[IFLA_MACVLAN_FLAGS] &&
1322	    nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC |
1323						      MACVLAN_FLAG_NODST))
1324		return -EINVAL;
1325
1326	if (data[IFLA_MACVLAN_MODE]) {
1327		switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1328		case MACVLAN_MODE_PRIVATE:
1329		case MACVLAN_MODE_VEPA:
1330		case MACVLAN_MODE_BRIDGE:
1331		case MACVLAN_MODE_PASSTHRU:
1332		case MACVLAN_MODE_SOURCE:
1333			break;
1334		default:
1335			return -EINVAL;
1336		}
1337	}
1338
1339	if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1340		switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1341		case MACVLAN_MACADDR_ADD:
1342		case MACVLAN_MACADDR_DEL:
1343		case MACVLAN_MACADDR_FLUSH:
1344		case MACVLAN_MACADDR_SET:
1345			break;
1346		default:
1347			return -EINVAL;
1348		}
1349	}
1350
1351	if (data[IFLA_MACVLAN_MACADDR]) {
1352		if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1353			return -EINVAL;
1354
1355		if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1356			return -EADDRNOTAVAIL;
1357	}
1358
1359	if (data[IFLA_MACVLAN_MACADDR_DATA]) {
1360		head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1361		len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1362
1363		nla_for_each_attr(nla, head, len, rem) {
1364			if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1365			    nla_len(nla) != ETH_ALEN)
1366				return -EINVAL;
1367
1368			if (!is_valid_ether_addr(nla_data(nla)))
1369				return -EADDRNOTAVAIL;
1370		}
1371	}
1372
1373	if (data[IFLA_MACVLAN_MACADDR_COUNT])
1374		return -EINVAL;
1375
1376	return 0;
1377}
1378
1379/*
1380 * reconfigure list of remote source mac address
1381 * (only for macvlan devices in source mode)
1382 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1383 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1384 */
1385static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1386				      struct nlattr *data[])
1387{
1388	char *addr = NULL;
1389	int ret, rem, len;
1390	struct nlattr *nla, *head;
1391	struct macvlan_source_entry *entry;
1392
1393	if (data[IFLA_MACVLAN_MACADDR])
1394		addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1395
1396	if (mode == MACVLAN_MACADDR_ADD) {
1397		if (!addr)
1398			return -EINVAL;
1399
1400		return macvlan_hash_add_source(vlan, addr);
1401
1402	} else if (mode == MACVLAN_MACADDR_DEL) {
1403		if (!addr)
1404			return -EINVAL;
1405
1406		entry = macvlan_hash_lookup_source(vlan, addr);
1407		if (entry) {
1408			macvlan_hash_del_source(entry);
1409			vlan->macaddr_count--;
1410		}
1411	} else if (mode == MACVLAN_MACADDR_FLUSH) {
1412		macvlan_flush_sources(vlan->port, vlan);
1413	} else if (mode == MACVLAN_MACADDR_SET) {
1414		macvlan_flush_sources(vlan->port, vlan);
1415
1416		if (addr) {
1417			ret = macvlan_hash_add_source(vlan, addr);
1418			if (ret)
1419				return ret;
1420		}
1421
1422		if (!data[IFLA_MACVLAN_MACADDR_DATA])
1423			return 0;
1424
1425		head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1426		len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1427
1428		nla_for_each_attr(nla, head, len, rem) {
1429			addr = nla_data(nla);
1430			ret = macvlan_hash_add_source(vlan, addr);
1431			if (ret)
1432				return ret;
1433		}
1434	} else {
1435		return -EINVAL;
1436	}
1437
1438	return 0;
1439}
1440
1441int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1442			   struct nlattr *tb[], struct nlattr *data[],
1443			   struct netlink_ext_ack *extack)
1444{
1445	struct macvlan_dev *vlan = netdev_priv(dev);
1446	struct macvlan_port *port;
1447	struct net_device *lowerdev;
1448	int err;
1449	int macmode;
1450	bool create = false;
1451
1452	if (!tb[IFLA_LINK])
1453		return -EINVAL;
1454
1455	lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1456	if (lowerdev == NULL)
1457		return -ENODEV;
1458
1459	/* When creating macvlans or macvtaps on top of other macvlans - use
1460	 * the real device as the lowerdev.
1461	 */
1462	if (netif_is_macvlan(lowerdev))
1463		lowerdev = macvlan_dev_real_dev(lowerdev);
1464
1465	if (!tb[IFLA_MTU])
1466		dev->mtu = lowerdev->mtu;
1467	else if (dev->mtu > lowerdev->mtu)
1468		return -EINVAL;
1469
1470	/* MTU range: 68 - lowerdev->max_mtu */
1471	dev->min_mtu = ETH_MIN_MTU;
1472	dev->max_mtu = lowerdev->max_mtu;
1473
1474	if (!tb[IFLA_ADDRESS])
1475		eth_hw_addr_random(dev);
1476
1477	if (!netif_is_macvlan_port(lowerdev)) {
1478		err = macvlan_port_create(lowerdev);
1479		if (err < 0)
1480			return err;
1481		create = true;
1482	}
1483	port = macvlan_port_get_rtnl(lowerdev);
1484
1485	/* Only 1 macvlan device can be created in passthru mode */
1486	if (macvlan_passthru(port)) {
1487		/* The macvlan port must be not created this time,
1488		 * still goto destroy_macvlan_port for readability.
1489		 */
1490		err = -EINVAL;
1491		goto destroy_macvlan_port;
1492	}
1493
1494	vlan->lowerdev = lowerdev;
1495	vlan->dev      = dev;
1496	vlan->port     = port;
1497	vlan->set_features = MACVLAN_FEATURES;
1498
1499	vlan->mode     = MACVLAN_MODE_VEPA;
1500	if (data && data[IFLA_MACVLAN_MODE])
1501		vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1502
1503	if (data && data[IFLA_MACVLAN_FLAGS])
1504		vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1505
1506	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1507		if (port->count) {
1508			err = -EINVAL;
1509			goto destroy_macvlan_port;
1510		}
1511		macvlan_set_passthru(port);
1512		eth_hw_addr_inherit(dev, lowerdev);
1513	}
1514
1515	if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1516		if (vlan->mode != MACVLAN_MODE_SOURCE) {
1517			err = -EINVAL;
1518			goto destroy_macvlan_port;
1519		}
1520		macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1521		err = macvlan_changelink_sources(vlan, macmode, data);
1522		if (err)
1523			goto destroy_macvlan_port;
1524	}
1525
1526	vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN;
1527	if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN])
1528		vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1529
1530	if (data && data[IFLA_MACVLAN_BC_CUTOFF])
1531		update_port_bc_cutoff(
1532			vlan, nla_get_s32(data[IFLA_MACVLAN_BC_CUTOFF]));
1533
1534	err = register_netdevice(dev);
1535	if (err < 0)
1536		goto destroy_macvlan_port;
1537
1538	dev->priv_flags |= IFF_MACVLAN;
1539	err = netdev_upper_dev_link(lowerdev, dev, extack);
1540	if (err)
1541		goto unregister_netdev;
1542
1543	list_add_tail_rcu(&vlan->list, &port->vlans);
1544	update_port_bc_queue_len(vlan->port);
1545	netif_stacked_transfer_operstate(lowerdev, dev);
1546	linkwatch_fire_event(dev);
1547
1548	return 0;
1549
1550unregister_netdev:
1551	/* macvlan_uninit would free the macvlan port */
1552	unregister_netdevice(dev);
1553	return err;
1554destroy_macvlan_port:
1555	/* the macvlan port may be freed by macvlan_uninit when fail to register.
1556	 * so we destroy the macvlan port only when it's valid.
1557	 */
1558	if (create && macvlan_port_get_rtnl(lowerdev)) {
1559		macvlan_flush_sources(port, vlan);
1560		macvlan_port_destroy(port->dev);
1561	}
1562	return err;
1563}
1564EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1565
1566static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1567			   struct nlattr *tb[], struct nlattr *data[],
1568			   struct netlink_ext_ack *extack)
1569{
1570	return macvlan_common_newlink(src_net, dev, tb, data, extack);
1571}
1572
1573void macvlan_dellink(struct net_device *dev, struct list_head *head)
1574{
1575	struct macvlan_dev *vlan = netdev_priv(dev);
1576
1577	if (vlan->mode == MACVLAN_MODE_SOURCE)
1578		macvlan_flush_sources(vlan->port, vlan);
1579	list_del_rcu(&vlan->list);
1580	update_port_bc_queue_len(vlan->port);
1581	unregister_netdevice_queue(dev, head);
1582	netdev_upper_dev_unlink(vlan->lowerdev, dev);
1583}
1584EXPORT_SYMBOL_GPL(macvlan_dellink);
1585
1586static int macvlan_changelink(struct net_device *dev,
1587			      struct nlattr *tb[], struct nlattr *data[],
1588			      struct netlink_ext_ack *extack)
1589{
1590	struct macvlan_dev *vlan = netdev_priv(dev);
1591	enum macvlan_mode mode;
1592	bool set_mode = false;
1593	enum macvlan_macaddr_mode macmode;
1594	int ret;
1595
1596	/* Validate mode, but don't set yet: setting flags may fail. */
1597	if (data && data[IFLA_MACVLAN_MODE]) {
1598		set_mode = true;
1599		mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1600		/* Passthrough mode can't be set or cleared dynamically */
1601		if ((mode == MACVLAN_MODE_PASSTHRU) !=
1602		    (vlan->mode == MACVLAN_MODE_PASSTHRU))
1603			return -EINVAL;
1604		if (vlan->mode == MACVLAN_MODE_SOURCE &&
1605		    vlan->mode != mode)
1606			macvlan_flush_sources(vlan->port, vlan);
1607	}
1608
1609	if (data && data[IFLA_MACVLAN_FLAGS]) {
1610		__u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1611		bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1612		if (macvlan_passthru(vlan->port) && promisc) {
1613			int err;
1614
1615			if (flags & MACVLAN_FLAG_NOPROMISC)
1616				err = dev_set_promiscuity(vlan->lowerdev, -1);
1617			else
1618				err = dev_set_promiscuity(vlan->lowerdev, 1);
1619			if (err < 0)
1620				return err;
1621		}
1622		vlan->flags = flags;
1623	}
1624
1625	if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) {
1626		vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1627		update_port_bc_queue_len(vlan->port);
1628	}
1629
1630	if (data && data[IFLA_MACVLAN_BC_CUTOFF])
1631		update_port_bc_cutoff(
1632			vlan, nla_get_s32(data[IFLA_MACVLAN_BC_CUTOFF]));
1633
1634	if (set_mode)
1635		vlan->mode = mode;
1636	if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1637		if (vlan->mode != MACVLAN_MODE_SOURCE)
1638			return -EINVAL;
1639		macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1640		ret = macvlan_changelink_sources(vlan, macmode, data);
1641		if (ret)
1642			return ret;
1643	}
1644	return 0;
1645}
1646
1647static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1648{
1649	if (vlan->macaddr_count == 0)
1650		return 0;
1651	return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1652		+ vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1653}
1654
1655static size_t macvlan_get_size(const struct net_device *dev)
1656{
1657	struct macvlan_dev *vlan = netdev_priv(dev);
1658
1659	return (0
1660		+ nla_total_size(4) /* IFLA_MACVLAN_MODE */
1661		+ nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1662		+ nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1663		+ macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1664		+ nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */
1665		+ nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */
1666		);
1667}
1668
1669static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1670				     const struct macvlan_dev *vlan,
1671				     const int i)
1672{
1673	struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1674	struct macvlan_source_entry *entry;
1675
1676	hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) {
1677		if (entry->vlan != vlan)
1678			continue;
1679		if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1680			return 1;
1681	}
1682	return 0;
1683}
1684
1685static int macvlan_fill_info(struct sk_buff *skb,
1686				const struct net_device *dev)
1687{
1688	struct macvlan_dev *vlan = netdev_priv(dev);
1689	struct macvlan_port *port = vlan->port;
1690	int i;
1691	struct nlattr *nest;
1692
1693	if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1694		goto nla_put_failure;
1695	if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1696		goto nla_put_failure;
1697	if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1698		goto nla_put_failure;
1699	if (vlan->macaddr_count > 0) {
1700		nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1701		if (nest == NULL)
1702			goto nla_put_failure;
1703
1704		for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1705			if (macvlan_fill_info_macaddr(skb, vlan, i))
1706				goto nla_put_failure;
1707		}
1708		nla_nest_end(skb, nest);
1709	}
1710	if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req))
1711		goto nla_put_failure;
1712	if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used))
1713		goto nla_put_failure;
1714	if (port->bc_cutoff != 1 &&
1715	    nla_put_s32(skb, IFLA_MACVLAN_BC_CUTOFF, port->bc_cutoff))
1716		goto nla_put_failure;
1717	return 0;
1718
1719nla_put_failure:
1720	return -EMSGSIZE;
1721}
1722
1723static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1724	[IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1725	[IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1726	[IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1727	[IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1728	[IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1729	[IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1730	[IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 },
1731	[IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT },
1732	[IFLA_MACVLAN_BC_CUTOFF] = { .type = NLA_S32 },
1733};
1734
1735int macvlan_link_register(struct rtnl_link_ops *ops)
1736{
1737	/* common fields */
1738	ops->validate		= macvlan_validate;
1739	ops->maxtype		= IFLA_MACVLAN_MAX;
1740	ops->policy		= macvlan_policy;
1741	ops->changelink		= macvlan_changelink;
1742	ops->get_size		= macvlan_get_size;
1743	ops->fill_info		= macvlan_fill_info;
1744
1745	return rtnl_link_register(ops);
1746};
1747EXPORT_SYMBOL_GPL(macvlan_link_register);
1748
1749static struct net *macvlan_get_link_net(const struct net_device *dev)
1750{
1751	return dev_net(macvlan_dev_real_dev(dev));
1752}
1753
1754static struct rtnl_link_ops macvlan_link_ops = {
1755	.kind		= "macvlan",
1756	.setup		= macvlan_setup,
1757	.newlink	= macvlan_newlink,
1758	.dellink	= macvlan_dellink,
1759	.get_link_net	= macvlan_get_link_net,
1760	.priv_size      = sizeof(struct macvlan_dev),
1761};
1762
1763static void update_port_bc_queue_len(struct macvlan_port *port)
1764{
1765	u32 max_bc_queue_len_req = 0;
1766	struct macvlan_dev *vlan;
1767
1768	list_for_each_entry(vlan, &port->vlans, list) {
1769		if (vlan->bc_queue_len_req > max_bc_queue_len_req)
1770			max_bc_queue_len_req = vlan->bc_queue_len_req;
1771	}
1772	port->bc_queue_len_used = max_bc_queue_len_req;
1773}
1774
1775static int macvlan_device_event(struct notifier_block *unused,
1776				unsigned long event, void *ptr)
1777{
1778	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1779	struct macvlan_dev *vlan, *next;
1780	struct macvlan_port *port;
1781	LIST_HEAD(list_kill);
1782
1783	if (!netif_is_macvlan_port(dev))
1784		return NOTIFY_DONE;
1785
1786	port = macvlan_port_get_rtnl(dev);
1787
1788	switch (event) {
1789	case NETDEV_UP:
1790	case NETDEV_DOWN:
1791	case NETDEV_CHANGE:
1792		list_for_each_entry(vlan, &port->vlans, list)
1793			netif_stacked_transfer_operstate(vlan->lowerdev,
1794							 vlan->dev);
1795		break;
1796	case NETDEV_FEAT_CHANGE:
1797		list_for_each_entry(vlan, &port->vlans, list) {
1798			netif_inherit_tso_max(vlan->dev, dev);
1799			netdev_update_features(vlan->dev);
1800		}
1801		break;
1802	case NETDEV_CHANGEMTU:
1803		list_for_each_entry(vlan, &port->vlans, list) {
1804			if (vlan->dev->mtu <= dev->mtu)
1805				continue;
1806			dev_set_mtu(vlan->dev, dev->mtu);
1807		}
1808		break;
1809	case NETDEV_CHANGEADDR:
1810		if (!macvlan_passthru(port))
1811			return NOTIFY_DONE;
1812
1813		vlan = list_first_entry_or_null(&port->vlans,
1814						struct macvlan_dev,
1815						list);
1816
1817		if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1818			return NOTIFY_BAD;
1819
1820		break;
1821	case NETDEV_UNREGISTER:
1822		/* twiddle thumbs on netns device moves */
1823		if (dev->reg_state != NETREG_UNREGISTERING)
1824			break;
1825
1826		list_for_each_entry_safe(vlan, next, &port->vlans, list)
1827			vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1828		unregister_netdevice_many(&list_kill);
1829		break;
1830	case NETDEV_PRE_TYPE_CHANGE:
1831		/* Forbid underlying device to change its type. */
1832		return NOTIFY_BAD;
1833
1834	case NETDEV_NOTIFY_PEERS:
1835	case NETDEV_BONDING_FAILOVER:
1836	case NETDEV_RESEND_IGMP:
1837		/* Propagate to all vlans */
1838		list_for_each_entry(vlan, &port->vlans, list)
1839			call_netdevice_notifiers(event, vlan->dev);
1840	}
1841	return NOTIFY_DONE;
1842}
1843
1844static struct notifier_block macvlan_notifier_block __read_mostly = {
1845	.notifier_call	= macvlan_device_event,
1846};
1847
1848static int __init macvlan_init_module(void)
1849{
1850	int err;
1851
1852	register_netdevice_notifier(&macvlan_notifier_block);
1853
1854	err = macvlan_link_register(&macvlan_link_ops);
1855	if (err < 0)
1856		goto err1;
1857	return 0;
1858err1:
1859	unregister_netdevice_notifier(&macvlan_notifier_block);
1860	return err;
1861}
1862
1863static void __exit macvlan_cleanup_module(void)
1864{
1865	rtnl_link_unregister(&macvlan_link_ops);
1866	unregister_netdevice_notifier(&macvlan_notifier_block);
1867}
1868
1869module_init(macvlan_init_module);
1870module_exit(macvlan_cleanup_module);
1871
1872MODULE_LICENSE("GPL");
1873MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1874MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1875MODULE_ALIAS_RTNL_LINK("macvlan");